Alkali-activated concretes containing blast furnace slag and fly ash cured at room temperature

Penman, Philip (2013) Alkali-activated concretes containing blast furnace slag and fly ash cured at room temperature. MSc dissertation, University of Portsmouth.

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    This report investigates the applicability of using a blend of ground granulated blast furnace slag (GGBFS) and Class F fly ash (FA) at differing ratio levels and with Sodium Silicate/Sodium Hydroxide alkali base of 1.25 Alkali Modulus. The testing was carried out using two different solutions of 7.5% and 12.5% Alkali Dosage. The purpose of this study was to identify suitable combination mixes to achieve similar compressive strengths using alkali-activated concretes to that of cement based systems.
    The different mixes were created, with a flow table test carried out in accordance to BS EN 1015-3 for each mix. The samples were cured for three, seven and 14 days, then a compressive strength test to BS EN 12390-3, with the cubes visually inspected to ensure method of failure was satisfactory according to BS EN 12390-3.
    The highest compressive strength achieved after 14 days was 80.92MPa carried out for AA7.5, 90, but it was shown that 80.47MPa was achieved with the mix AA7.5, 70. It was shown that the higher content fly ash mixes were more reactive with an alkali solution of 7.5% Alkali Dosage. The equivalent mixes for C30, C40 and C50 were AA7.5, 20, AA7.5, 30 and AA7.5, 30 respectively, but through interpolation, it is expected that a more suitable replacement for C30 could be with a mix with 25% GGBFS and 75% FA.. Additional experimental testing is required to determine suitability of materials for alternative to Ordinary Portland Cement (OPC) based concretes, including tensile strength testing and shrinkage.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 01 Aug 2014 09:15
    Last Modified: 28 Jan 2015 12:39

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